/*
 Print.cpp - Base class that provides print() and println()
 Copyright (c) 2008 David A. Mellis.  All right reserved.
 
 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.
 
 This library is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Lesser General Public License for more details.
 
 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
 Modified 23 November 2006 by David A. Mellis
 Modified 03 August 2015 by Chuck Todd
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <stddef.h>
#include <stdarg.h>
#include <math.h>
#include "Arduino.h"

#include "Print.h"

size_t Print::write(const uint8_t *buffer, size_t size){
    size_t n = 0;
    while (size--) {
        n += write(*buffer++);
    }
    return n;
}

size_t Print::printf(const char *format, ...) {
    va_list arg;
    va_start(arg, format);
    char temp[4096];
    size_t len = vsnprintf(temp, 4096, format, arg);
    len = print(temp);
    va_end(arg);
    return len;
}

size_t Print::print(const String &s){
    return write(s.c_str(), s.length());
}

size_t Print::print(const char *str){
    return write(str);
}

size_t Print::print(char c){
    return write(c);
}

size_t Print::print(unsigned char b, int base){
    return print((unsigned long) b, base);
}

size_t Print::print(int n, int base){
    return print((long) n, base);
}

size_t Print::print(unsigned int n, int base){
    return print((unsigned long) n, base);
}

size_t Print::print(long n, int base){
    if (base == 0) {
        return write(n);
    } else if (base == 10) {
        if (n < 0) {
            int t = print('-');
            n = -n;
            return printNumber(n, 10) + t;
        }
        return printNumber(n, 10);
    } else {
        return printNumber(n, base);
    }
}

size_t Print::print(unsigned long n, int base){
    if (base == 0) return write(n);
    else return printNumber(n, base);
}

size_t Print::print(double n, int digits){
    return printFloat(n, digits);
}

size_t Print::print(const Printable& x){
    return x.printTo(*this);
}

size_t Print::println(void){
    size_t n = print('\r');
    n += print('\n');
    return n;
}

size_t Print::println(const String &s){
    size_t n = print(s);
    n += println();
    return n;
}

size_t Print::println(const char *s){
    size_t n = print(s);
    n += println();
    return n;
}

size_t Print::println(char c){
    size_t n = print(c);
    n += println();
    return n;
}

size_t Print::println(unsigned char b, int base){
    size_t n = print(b, base);
    n += println();
    return n;
}

size_t Print::println(int num, int base){
    size_t n = print(num, base);
    n += println();
    return n;
}

size_t Print::println(unsigned int num, int base){
    size_t n = print(num, base);
    n += println();
    return n;
}

size_t Print::println(long num, int base)
{
    size_t n = print(num, base);
    n += println();
    return n;
}

size_t Print::println(unsigned long num, int base){
    size_t n = print(num, base);
    n += println();
    return n;
}

size_t Print::println(double num, int digits){
    size_t n = print(num, digits);
    n += println();
    return n;
}

size_t Print::println(const Printable& x){
    size_t n = print(x);
    n += println();
    return n;
}

// Private Methods /////////////////////////////////////////////////////////////

size_t Print::printNumber(unsigned long n, uint8_t base) {
    char buf[8 * sizeof(long) + 1]; // Assumes 8-bit chars plus zero byte.
    char *str = &buf[sizeof(buf) - 1];

    *str = '\0';

    // prevent crash if called with base == 1
    if (base < 2) base = 10;

    do {
        unsigned long m = n;
        n /= base;
        char c = m - base * n;
        *--str = c < 10 ? c + '0' : c + 'A' - 10;
    } while(n);

    return write(str);
}

size_t Print::printFloat(double number, uint8_t digits) { 
    size_t n = 0;

    if (isnan(number)) return print("nan");
    if (isinf(number)) return print("inf");
    if (number > 4294967040.0) return print ("ovf");  // constant determined empirically
    if (number <-4294967040.0) return print ("ovf");  // constant determined empirically

    // Handle negative numbers
    if (number < 0.0){
        n += print('-');
        number = -number;
    }

    // Round correctly so that print(1.999, 2) prints as "2.00"
    double rounding = 0.5;
    for (uint8_t i=0; i<digits; ++i)
        rounding /= 10.0;

    number += rounding;

    // Extract the integer part of the number and print it
    unsigned long int_part = (unsigned long)number;
    double remainder = number - (double)int_part;
    n += print(int_part);

    // Print the decimal point, but only if there are digits beyond
    if (digits > 0) {
        n += print(".");
    }

    // Extract digits from the remainder one at a time
    while (digits-- > 0){
        remainder *= 10.0;
        int toPrint = int(remainder);
        n += print(toPrint);
        remainder -= toPrint;
    }

    return n;
}
